Before anything else, you need to read the guides and also research the basics of English grammar. If English is not your first language, then I would suggest seeing if we have an affiliate site in it.

I would also advise you to read more articles from Series 3, and properly format your draft. Good luck!

When orally ingested by brewing a coffee the subject loses the need and ability to sleep and becomes immortal.

This is probably enough to garner a slough of downvotes.

Right now, you have an object with a clearly defined activation and function, with no context or backstory, essentially a generic magic object. At this point the idea seems to be more of an entry on the anomalous items list than an SCP that would merit specific Foundation containment. We already have tons of objects on the site that are just [thing] that does [effect], most of them very old and not quite up to current site expectations.

To quote vezaz, "Get away from "type of object" or "sort of creature" and instead start thinking about stories you want to tell. Start looking for moments in your everyday life that give you pause, that are unusual, or that make you go off into a daydream. Then think about bringing the reader to that same moment."

Also, in regards to the writing itself, have you taken any advanced high school writing classes? Most site writers here have college-level or above writing experience, and have at some point needed to write with professional (or at least AP English level) tone. If you haven't needed to write clinically before, it can help to check some resources on how to sound professional.